Magnetic and topological transitions in three-dimensional topological Kondo insulator

作     者：黎欢 王志勇 郑晓军 刘瑜 钟寅 

作者机构：College of Science Guilin University of Technology Institute of Applied Physics and Computational Mathematics Software Center for High Performance Numerical Simulation China Academy of Engineering Physics Center for Interdisciplinary Studies & Key Laboratory for Magnetism and Magnetic Materials of the MoELanzhou University 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2018年第35卷第12期

页      面：59-63页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 11764010,11504061,11564008,11704084,and 11704166 the Natural Science Foundation of Guangxi Province under Grant Nos 2017GXNSFAA198169 and 2017GXNSFBA198115 the SPC-Lab Research Fund under Grant No XKFZ201605 

主　　题：STI WTI TKI 

摘      要：Using an extended slave-boson method,we draw a global phase diagram summarizing both magnetic phases and paramagnetic（PM） topological insulators（TIs） in a three-dimensional topological Kondo insulator（TKI）. By including electron hopping（EH） up to the third neighbors, we identify four strong TI（STI） phases and two weak TI（WTI） phases. Then, the PM phase diagrams characterizing topological transitions between these TIs are depicted as functions of EH,f-electron energy level,and hybridization constant. We also find an insulator-metal transition from an STI phase that has surface Fermi rings and spin textures in qualitative agreement with the TKI candidate SmBs. In the weak hybridization regime, antiferromagnetic（AF） order naturally arises in the phase diagrams. Depending on how the magnetic boundary crosses the PM topological transition lines,AF phases are classified into the AF topological insulator（AFTI） and the non-topological AF insulator, according to their Z2 indices. In two small regions of parameter space, two distinct topological transition processes between AF phases occur, leading to two types of AFTIs showing distinguishable surface dispersions around their Dirac points.